Apple has an Apple Music app [1] on the Play Store for Android, and is accessible through iTunes (ugh...) on the desktop on both Windows and Mac. (No Linux support unless you can coax iTunes into running on Wine, and no web UI.)

Apple Music's reasonably viable as long as you're only using it on mobile; its viability on the desktop really depends on your ability to tolerate iTunes. Suffice it to say that I remained a Spotify user after my Apple Music trial was up, and I'm otherwise heavily invested in the Apple ecosystem.

[1] https://play.google.com/store/apps/details?id=com.apple.andr...